The drive system and the supports are plastic and are easily broken. If you are the only driver, You can glue a piece of hard rubber to the bottom of the glass, between the glass and the outer cover and save the two hundred dollars for a new mirror. I did this for several of my customers.
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.